An airplane was moving 50 mys to the north relative to the air at landing. The wind was blowing 5 m/s toward the south relative to the ground. What was the speed of the airplane relative to the ground at the time of landing?
10 m/s
45 m/s
55 m/s
250 m/s

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

Name two kinds of practical electric pumps.